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' GUT-OFF GEAR FOR STEAM ENGINES. No. 459,568.

2 L H A D R E T S E V R K Patented-Sept. 15, 1891.

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K. E. VESTERDAHL. GUT-0P1? GEAR FOR STEAM ENGINE-S.

No. 459,568. Patented Sept. 15, 1891,

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NITED STATES PATENT Prion.

KARL E. VESTERDAHL, OF NElV YORK, N. Y.

CUT-OFF GEAR FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 459,568, dated September 15, 1891.

Application filed November 28, 1890. Serial No. 372,814. (No model.)

To all whom it may concern.-

Be it known that I, KARL E. VESTERDAHL, a citizen of Sweden, and a resident of New York city, county and State of New York,

have invented new and useful Improvements in Cut-Off Gear for Steam-Engines, of which the following is a specification.

My invention consists in animproved contrivance of variable releasing apparatus controlled by the governor for permitting the valves to be closed by any suitable appliance, as a piston subject to a vacuum on one side, the valves being of the kind that work in a rocking motion, all as hereinafter fully described, reference being made to the accompanying drawings, in which- Figure 1 is a side elevation of some portions of a compound engine having releasing apparatus of my inventiomwith two of the covers detached and the valves shown in cross-section. Fig. 2 is a plan view of some portions of the same. Fig. 8 is a front elevation of the gear for one of thevalves on an enlarged scale, and Fig. 4 is a section of Fig. 3 on line as m.

In the drawings I have represented a compound engine with valve-gear of the Corliss type for illustrating the application of my invention; but it may be applied to various types of engines and valve-gear.

a represents the small cylinder, and b the large one.

0 represents the steamwalves, one being uncovered and shown in section and the other geared up with the working devices on each cylinder.

(1 represents the rockers geared with eccentrics and connected with the steam-valves for opening them, and also in practice geared with the exhaust-valve (not shown) for both.

opening and closing them in the usual way. The steam-valves have a stem 0, extending out-through the stuffing-box f and the bearing-stud g and having the crank it keyed fast to the outer end. This crank is connected by the wrist-pin '1: with the rod j,having a piston below subject to a vacuum for pulling the rod down and closing the valve when released in the well-known arrangement of such devices, (not necessary to be shown,) or any other approved contrivance having a constant tendency to pull said rod down may be employed as a spring. Said crank also has a toe k at the end, with which there is a lifting and releasing hook Z, suitably arranged on the pivot m at the extremity of one of the arms of the rocker 'n, to catch and open the valve at the propertime, said rocker n being pivoted on the bearinghub g independently of the valve-stem and connected by the rod 0 with the rocker d, worked by the engine and traversing synchronously therewith. The said hook has an arm 19, which traverses a variable tripper t, for disengaging the hook and subject to the control of the governor, said tripper being mounted on the curved stud-piece u so as to slide forward and backward concentrically to the axis of the crank it under the influences of the governor, suitably connected to it for that purpose, and having the offset .9 between the concentric ways q q, along which the said arm traverses. The spring o, secured at w to the extremity of rocker 'n. and bearing against the back of the hook, tends to keep the end of arm 19 in bearing-contact with said ways of the tripper, said arm preferably having an anti-friction roll 00 for bearing on said Ways. It will be seen that the radius of the way q is such that the hookZ is permitted to engage the toe when the hook is swung down for that purpose by the rocker n and to hold said toe on the return movement for opening the Valve and keeping it open until the end of the arm reaches the offset 5, which trips the hook and releases the valve, which is then closed by the said piston-spring or whatever other debelt or other cause that the tripper should be shifted out of its normal position, and they also limit the pressure of the roller w on the way (1 to lessen the wear on said way, and said rocker also has another stud 2, and crank It has a stop 3, to close the valve in case the vacuum or other device employed for that'purpose happens to fail. Both these studs and stops are shown in dotted lines in Fig. 3. The hook and the toe are re-enforced with hardened-steel faces at for durability, and they are detachably connected for renewal when required. The valves of each cylinder are geared reversely to each other in the usual manner, and the trippers t are therefore respectively connected to the opposite ends of the centrally-pivoted rock-levers 11, one of which is actuated by the governor and the other by the one so actuated, the two being connected by the rod 5, to which the trippers of one end of each cylinder are also connected,and the tripper of the other ends being connected to the said rocklevers respectively by rods 6. The rockers d are coupled by the rod 7, and one is connected to the eccentric through rod 8, rock-lever 9,

and rod 10, as such parts are usually con-i nected.

I am aware that lifting-hooks and variable trippers have been used in various arrangements for releasing the valves, and I do not claim them, broadly.

It will be seen that the large radius of the bearing of the tripper t and the connection of the rod 5 at a still larger radius are calculated to render the action easier and less wearing to the parts than in the case of a disk located on the hub g or stem e and employed for the like purpose, and in which the radius of the offset way is shorter than the radius of the tripping-hook pivot.

I claim- 1. In a valve opening and tripping device, the combination, with the valve-crank connected with the closing device and having the lifting-toe, the opening-rocker, and the lifting-hook and its trippingarm pivoted on said'rocker, of the tripper controlling the tripping-arm of the hook, having its offset ways on a larger radius than that of the pivot of the lifting-hook and mounted and sliding on a stationary support, also of larger radius than said pivot.

2. The combination, with the valve-crank having the lifting-toe and the rocker pivoted in the axis of the crank and working synchronously with the engine, of the liftinghook pivoted on said rocker, the tripperhaving the offset ways concentric with the axis of the valve and adapted to slide on the fixed support concentrically with said axis and subject to the governor, the arm of the lifting-hook traversing the said ways of the tripper, the stud on the rocker, and the stop on the tripping-arm to limit the pressure of the said arm on the wall of guideway, substantially as described.

In testimony that I claim the foregoing as my invention I have signed my name, in-presence of two witnesses, this th day of November, 1890.

KARL E. VESTERDAHL.

Witnesses:

W. J. MORGAN, W. B. EARLL. 

